Just saw the movie, and it was great! I'm not sure the interconnectedness was intended as information transfer, though. They had to communicate with the other tribes by actually going there. It seemed like the network was more like the brain of a planetary organism (eywa). Each individual could access and add to the memories, but was not a communication network. An interesting approach--they truly are "one with the world" in a way other sci-fi (Babylon 5, for example) does inelegantly.